428228641 has 4 divisors (see below), whose sum is σ = 438673284. Its totient is φ = 417784000.

The previous prime is 428228629. The next prime is 428228653. The reversal of 428228641 is 146822824.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (428228629) and next prime (428228653).

It can be written as a sum of positive squares in 2 ways, for example, as 152004241 + 276224400 = 12329^2 + 16620^2 .

It is a cyclic number.

It is not a de Polignac number, because 428228641 - 2¹³ = 428220449 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 428228641.

It is not an unprimeable number, because it can be changed into a prime (428228621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5222260 + ... + 5222341.

It is an arithmetic number, because the mean of its divisors is an integer number (109668321).

Almost surely, 2^428228641 is an apocalyptic number.

428228641 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

428228641 is a deficient number, since it is larger than the sum of its proper divisors (10444643).

428228641 is a wasteful number, since it uses less digits than its factorization.

428228641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10444642.

The product of its digits is 49152, while the sum is 37.

The square root of 428228641 is about 20693.6860177205. The cubic root of 428228641 is about 753.7463756590.

It can be divided in two parts, 4282 and 28641, that added together give a palindrome (32923).

The spelling of 428228641 in words is "four hundred twenty-eight million, two hundred twenty-eight thousand, six hundred forty-one".